Generic estimates for magnetic fields generated during inflation including Dirac-Born-Infeld theories

Details Generic estimates for magnetic fields generated during inflation including Dirac-Born-Infeld theories Generic estimates for magnetic fields generated during inflation including Dirac-Born-Infeld theories

2008-05-26

arxiv.org/abs/0805.3862v2

Phys.Rev.D78:043524,2008

Astronomy and Astrophysics

Astrophysics

7 pages, no figure, accepted in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.78.043524

We estimate the strength of large-scale magnetic fields produced during inflation in the framework of Dirac-Born-Infeld (DBI) theories. This analysis is sufficiently general in the sense that it covers most of conformal symmetry breaking theories in which the electromagnetic field is coupled to a scalar field. In DBI theories there is an additional factor associated with the speed of sound, which allows a possibility to lead to an extra amplification of the magnetic field in a ultra-relativistic region. We clarify the conditions under which seed magnetic fields to feed the galactic dynamo mechanism at a decoupling epoch as well as present magnetic fields on galactic scales are sufficiently generated to satisfy observational bounds.

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